FIELD: laser technology. SUBSTANCE: laser has case, cold cathode disposed within the case and made in form of roll of metal sheet. Cathode is attached to laser case by ends of the roll. Laser case forms cathode space. Ends of roll are removed one from another for distance, determined by relation p<d≅ K/j2/5·p1/5, where j is current density of the cathode, A/m2, P is gas mixture pressure, Pa; d is distance between ends of the roll, mm. K=0,7·102(A/m3)2/5·Pa. EFFECT: improved efficiency. 1 dwg
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